To be honest, I know next to nothing in Fclass.
I was hoping to get a Manners with mini chassis, inletted for a Bighorn TL3 single shot, with a 30'' IBI small shank .308 prefit chambered for 200SMKs, and a NF competition scope with Fclass reticle.
That way I can assemble on my own to keep cost down.
It would be my beginners setup to learn with, then maybe later on get a custom build if I like it.
With the McMillan, I believe it would be bedding mandatory, probably custom inletting required too.